Nissan Teana J32. Manual - part 378

EC-50

< FUNCTION DIAGNOSIS >

[VQ25DE, VQ35DE]

AIR CONDITIONING CUT CONTROL

Component Description

INFOID:0000000003856476

1.

Fuel level sensor unit and fuel pump 
harness connector

2.

Fuel pressure regulator

3.

Fuel level sensor unit and fuel pump

: Vehicle front

JMBIA1385ZZ

Component

Reference

Accelerator pedal position sensor

EC-304, "Description"

Camshaft position sensor (PHASE)

EC-222, "Description"

Crankshaft position sensor (POS)

EC-218, "Description"

Engine coolant temperature sensor

EC-157, "Description"

Power steering pressure sensor

EC-236, "Description"

Refrigerant pressure sensor

EC-348, "Description"

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-51

< FUNCTION DIAGNOSIS >

[VQ25DE, VQ35DE]

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AUTOMATIC SPEED CONTROL DEVICE (ASCD)

System Diagram

INFOID:0000000003856477

System Description

INFOID:0000000003856478

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM through CAN communication line

BASIC ASCD SYSTEM

Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE lamp and SET lamp in combination meter. If any malfunc-
tion occurs in the ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.

SET OPERATION

Press MAIN switch. (The CRUISE lamp in combination meter illuminates.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch. (Then SET lamp in combination meter illuminates.)

ACCELERATE OPERATION

If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will maintain the new set speed.

CANCEL OPERATION

When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed
• More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)

JMBIA1494GB

Sensor

Input signal to ECM

ECM function

Actuator

ASCD brake switch

Brake pedal operation

ASCD vehicle speed 
control

Electric throttle control 
actuator

Stop lamp switch

Brake pedal operation

ASCD steering switch

ASCD steering switch operation

TCM (VQ35DE engine)
Park/neutral position (PNP) switch (VQ25DE 
engine)

Gear position

Powertrain revolution*

ABS actuator and electric unit (control unit)

Vehicle speed*

EC-52

< FUNCTION DIAGNOSIS >

[VQ25DE, VQ35DE]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

• Brake pedal is depressed
• Selector lever position is N, P or R
• Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
• TCS system is operated
• CVT control system has a malfunction. Refer to 

EC-280, "Description"

.

When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking indicator lamp.
• Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may

blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.

• Malfunction for some self-diagnoses regarding ASCD control: SET lamp will blink quickly.
If MAIN switch is turned to OFF while ASCD is activated, all of ASCD operations will be canceled and vehicle
speed memory will be erased.

COAST OPERATION

When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the
switch is released. And then ASCD will maintain the new set speed.

RESUME OPERATION

When the RESUME/ACCELERATE switch is pressed after cancel operation other than pressing MAIN switch
is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must
meet following conditions.
• Brake pedal is released
• Selector lever position is other than P and N
• Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-53

< FUNCTION DIAGNOSIS >

[VQ25DE, VQ35DE]

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Component Parts Location

INFOID:0000000003857774

1.

Intake valve timing control solenoid 
valve (bank 1)

2.

Intake valve timing control solenoid 
valve (bank 2)

3.

Electronic controlled engine mount 
control solenoid valve

4.

Fuel injector (bank 2)

5.

Cooling fan motor-2

6.

A/F sensor 1 (bank 2)

7.

Ignition coil (with power transistor) 
and spark plug (bank 2)

8.

Camshaft position sensor (PHASE) 
(bank 2)

9.

Crankshaft position sensor (POS)

10. Engine coolant temperature sensor

11.

Cooling fan motor-1

12. ECM

13. Refrigerant pressure sensor

14. Battery current sensor

15. IPDM E/R

16. Mass air flow sensor (with intake air 

temperature sensor)

17. Electric throttle control actuator

18. Power valve actuator 2 (VQ35DE 

models)

19. EVAP canister purge volume control 

solenoid valve

20. Camshaft position sensor (PHASE) 

(bank 1)

21. Ignition coil (with power transistor) 

and spark plug (bank 1)

22. A/F sensor 1 (bank 1)

23. Fuel injector (bank 1)

24. VIAS control solenoid valve 1 and 2 

(VQ35DE models)

25. Power valve actuator 1

JMBIA1373ZZ